Median household incomes are rising fastest in the South, with Atlanta; Birmingham, Ala.; and Nashville, Tenn., showing the biggest gains. Austin, Texas; Memphis, Tenn.; Orlando; and Raleigh, N.C., are also showing robust gains, meaning that seven of the 15 big cities growing faster than 5 percent are in the South. Nashville showed a 10 percent increase in median household income between 2014 and 2015.
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